I just got a CoolSat 8000 and where i live there is a direct tv dish with one LNB and double polarization, can use this dish with my receiver and which satellites will I be able to get
If the dish is pointed at a DirectTV satellite you will get nothing. It will have to be aimed at one of the dish network birds as listed in the thread in the post by dfergie. To do that, the azimuth (compass direction) and elevation (how high it points in the sky) would need to be changed to point at the satellite you choose to watch.
Bob